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I always have an old version of the source code of Solaris' bdiff with me (https://github.com/Arkanosis/Arkonf/blob/master/tools-src/bd...), just in case. It might have changed in the meantime in OpenIndiana / Illumos.

It was a very significant improvement in speed a few years ago — though with time I've gotten more RAM faster than bigger files to run diff on, and I haven't had any difficulty with the regular Linux diff for a long time.

Wow, zero memory usage and immediate output on files where GNU diff just sits there eating memory until everything is read! Thanks, that's fantastic.

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